The Difference between Activation Energies for the Layer Growth and Interdiffusion in an Intermediate Phase Formed in a Poly-Phase Diffusion Couple

Abstract

The purpose of this study was to account for the origin of the difference between activation energies for the layer growth and interdiffusion in an intermediate phase which was formed in a poly-phase diffusion couple. It was shown that this difference between the two activation energies seems to originate from the temperature dependence of the homogeneity range of the phase. Accordingly, the activation energy of the layer growth (QK2) is equal to a sum of the energy of the interdiffusion (QD) and that attributable to the temperature dependence of the homogeneity range of the phase (Qg).which coincides with QK2 within the experimental accuracy.It is also concluded that the activation energy for a layer growth does not coincide with that for an interdiffusion in the phase where the change in the concentration with temperature at that phase boundary is found.

Kinetics and Mechanism of Growth of β-Solid Solution during Reaction Diffusion in Binary Titanium and Zirconium Alloy Systems

“…In materials technology, such situations are encountered during diffusion bonding, cladding, sintering, precipitation, oxidation and sulfurization etc. The distribution of alloy phases in the diffusion zone and their growth kinetics are the major considerations in any investigation on reaction diffusion [1][2][3][4][5][6][7][8][9][10][11][12]. The various aspects of the reaction diffusion have been extensively reviewed in a recent book by Dybkov [13].…”